Occasionally Jigasi stop forwarding SIP audio due to race condition

[ruozhen-vsee]

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Description

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Occasionally Jigasi hit the issue that SIP audio stopped working and likely its due to:

When having two capture devices available, its possible that concurrent Jigasi SIP call causes DevicePreferences field ordered wrongly due to race condition. (loadDevicePreferences/saveDevice/writeDevicePreferences)

As a result, the non preferred noTransferData audio silence capture device will be wrongly picked as the preferred one and causes no audio issue. The noTransferData audio silence capture device will remain as the most preferred device until the race condition reset it, or restart the Jigasi server.

Current behavior

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Jigasi stopped forwarding SIP audio data.

Expected Behavior

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Jigasi should always successfully forward audio data.

Possible Solution

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Proper fix probably require refractory the Devices.java class

Disable noTransferData audio silence capture device from AudioSilenceSystem is being used as a temp hack as its not needed for Jigasi SIP gateway mode.

 src/main/java/org/jitsi/impl/neomedia/device/AudioSilenceSystem.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/java/org/jitsi/impl/neomedia/device/AudioSilenceSystem.java b/src/main/java/org/jitsi/impl/neomedia/device/AudioSilenceSystem.java
index 48a0db72..b5bb41a7 100644
--- a/src/main/java/org/jitsi/impl/neomedia/device/AudioSilenceSystem.java
+++ b/src/main/java/org/jitsi/impl/neomedia/device/AudioSilenceSystem.java
@@ -64,6 +64,9 @@ protected void doInitialize()
         // capture device is required but no audio samples from it are necessary
         // such as negotiating signalling for audio but actually RTP translating
         // other participants/peers' audio.
+        System.out.println("AudioSilenceSystem Disable " 
+            + "AudioSilenceCaptureDevice:" + DataSource.NO_TRANSFER_DATA);
+        /*
         captureDevices.add(
             new CaptureDeviceInfo2(
                     "AudioSilenceCaptureDevice:" + DataSource.NO_TRANSFER_DATA,
@@ -73,6 +76,7 @@ protected void doInitialize()
                                 + DataSource.NO_TRANSFER_DATA),
                     DataSource.SUPPORTED_FORMATS,
                     null, null, null));
+                    */
 
         setCaptureDevices(captureDevices);
     }

Steps to reproduce

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It's hard to reproduce, as it only happens when simultaneous requests come in.

Environment details

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